Access denied to external Hard Drive on Windows 7?

Hey,
Thanks in Advance for your help. Yesterday I downloaded and installed Windows 7 (which looks like its going to be a massive improvement on Vista!!). Though I had a problem when I tried to open my external Hard drive (which is an Internal hard drive in an enclosure ":H"). An error message pops up every time I double click it saying that access to this drive is denied.
This used to happen when I would change from PC to PC but was able to fix it using instructions from this Link http://www.le.ac.uk/cc/dsss/docs/acls2.shtml
Any help would be much appreciated.
Regards
Jordan

Folks,
I faced a similar problem when trying to move a NTFS formatted disk from XP to windows 7. I tried suggestions on various forums but nothing worked. Finally though, i was able to identify the root cause empirically and fix it.
1. In my understanding, Windows 7 interprets the permissions on a NTFS drive very strictly. Hence while a NTFS HDD with tweaked security settings - say with only administrator access/ownership under security tab may work perfectly in XP, OS X, Ubuntu etc
, Win 7 will show you access denied unless permissions for ALL of the following: AuthenticatedUsers, SYSTEM, Administrator & Users is set correctly (which is default for a newly formatted drive in windows)
2. You can do this either manually by adding these one by one or by simply formatting the drive (this however is destructive for data).
3. I therefore simply set the permissions correctly AFTER taking ownership of the drive and I was able to access the drive just fine.
4. To prove that its merely a permission issue where Windows 7 is arguabily behaving correctly, before making any permission changes, try booting your computer in Safe Mode and you should be able to access your data just fine while you are in the Safe Mode.
5. Lesson for me was to be very careful with NTFS permissions, especially while removing those present by default.
6. I managed to solve the issue before seeing this thread. Hence i do not know if "foreign drive" solution below would have worked in my case.
To Microsoft: This solution should be WAY more easier to find on the net. Hell, its shouldn't even be a be a problem! Windows should be able to reset the permissions to default with a single click on a non encrypted NTFS drive if the person trying to do this
has the administrator access.
Hope this allows people to save time and data.
Cheers!

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